Electric system.



J. L. CREVELING.

ELECTRIC SYSTEM.

APPLICATION FILED SEPT.30,1909.

1 1 43, 1 76. Patented J un 15, 1915.

Q I Q l h liweoaea 3140214 {07,

UNITED STATES PATENT OFFICE.

JOHN L. CREVELING, OF NEW YORK, N. Y., ASSIGNOR TO SAFETY CAR HEATINGAND LIGHTING COHPAN Y, A CORPORATION OF NEW JERSEY.

ELECTRIC SYSTEM.

Application filed September 80, 1909: Serial No. 520,273.

To all whom it may concern: a

Be it known that I, JoiiN L.

State of New York,

electric systems wherein a generator is used to charge a storage batteryand supply cur rent to lamps or other translating devices.

My invention has for its particular object to provide means'whereby agenerator driven at variable speed: may be operated to auto- I maticallydeliver a predetermined current to the storage battery regardless ofthe'current consumed by the lamps or other translating devices and nothave the operation of the means for thus regulating the dynamo rendereddetrimental by current flowing from the battery to the lamps ortranslating devices when the generator is inoperative or run at suchspeed that it supplies only a portion of the current consumed in thesystem.

Figure I is a diagram setting forth a system embodying my invenion. Fig.II is a diagram of a portion of a system similar to Fig. I in which aslight modification appears as will hereinafter be explained.

Referring to the drawing, particularly Fig. I, 1 represents a dynamo orgenerator 7 in which the positive lead 2 is carried to the coil 3terminating in the contact I of. any suitable type of automatic switchas indicated at 5. From the other contact'6 of the said switch the main7 is ledto the positive terminal of the storage battery 8 and lamps orother translating devices indicated at 9. From the other terminal of thetranslating devices the lead 10 is carried to the negative brush of thegenerator 1. The negative side of the storage battery 8.is connectedwith the conductor 11 which leads to the coil 12 which the wire 13connects with the lead 10. The automatic switch 5 may be provided withany suitable operating coil as indicated at 15 and connected with thelead 10 as by the Wire 14.

16 represents the field coil of the generator which may be connectedwith one brush of the generator as indicated and terminate in anysuitable type of variable resistance 17 in this instance indicated ofthe carbon disk variety for sake of clearness. The other Specificationof Letters latent.

Patented June 15, 1915.

side of the variable resistance 17 is connected A l with the op ositebrush of the generator as.

by means 0 mally wire 18. The lever 19 15.11013;- '7 drawn in anupwarddirection by-theg- .adjustable spring 20 so as to tend to com? pact thecarbons 17 and reduce the resistance thereof. v v 21 represents a coilcarried by the lever 19.

and connected with the contact member of the switch 5 as bv wire 22 andwith the conductor 11 as by wire 23.

Referring to Fig. II the same shows a portion of the system shown inFig. I in V which like numerals indicate like parts and the portion ofthe system shown is identical with that shown in Fig. I with theexception that the wire 22 instead of connecting with the contact memberof the switch 5 is connected directly to the main 7.

The practical operation of my improved system is substantially asfollows reference being had to Fig. I and starting with the generator atrest and current supplied to the lamps or translating devices by thebattery 8: The current passing from the battery 8 through the lamps 9,lead 10, wire 13, coil 12 and conductor 11 to the battery will cause thecoil 12 toset up a magnetic flux in a given direction which may bedetermined and the strength of which will be a direct function of thecurrent used by the lamps or translating devices. If the generator bestarted and brought to the proper voltage. the coil 15 will and if thisvoltage be slightly in excess of that of the storage battery a smallcurrent may fiow from the generator through lead 2, coil 3, switch 5,mam 7, translating devices 9, lead. 10 to the generator which will causea slight diminution in the amount of current flowing from the storagebattery through the lamps or translating devices as above outlined. Atthis time, current will also flow from the main 7, through the wire 22,coil 21 and wire 23, to the conductor 11, and thence to the battery 8;in other words, a part of the generator current, instead of passing fromthe switch 5 directly through the main 7, is shunted through the wire22, coil 21, conductor 11 and battery 8 to the translating devices 9.The battery 8 will continue to supply current to the translating devicesand its circuit will be completed cause the switch 5 to close coil 21will cause the same to tend to set up a magnetic flux, the direction ofwhich may be predetermined and is so chosen as to oppose the flux set upby the coil 12 when current flows from the battery 8 to the lamps ortranslating devices as above set forth. Therefore, under theseconditions above outlined, coil 21 and coil 12 will tend to repel eachother and they may be caused to exert force in such direction as to tendto assist the spring 20 in compacting the variable resistance 17- so asto reduce the resistance in the field circuit and cause the generatoroutput to tend to rise. If the speed of the generator be increased andits output increased until it is supplying the total current to thelamps or translating devices there will be no current flowing in thecoil 12 and the same will have no action upon the coil 21. If thegenerator voltage increase, current will now flow into the battery so asto charge the same and will flow through the coil 12 in a directionopposed to that when the current was supplied from the battery to thelampscoil 21 and the two coils will attract each other. Therefore, itwill be seen that the magnetic effect of the coils 12 and 21 is eitherof a conjoint or differential nature, dependent upon the current flowfrom the generator or from the battery, or upon the number oftranslating devices in use. By properly arranging the lever 19 andproperly adjusting the spring 20 this attraction between the coils 21and 1.2 may be caused to move the lever 19 when a predetermined currentis being supplied to the battery in such manner as to increase theresistance 17 and cut down the generator field so as to hold the currentsupplied to the battery practically constant throughout furtherincreases in speed of the generator and if the generator shall slow downuntil it is not supplying the entire current to the translating devicesthat portion supplied from the battery will pass through the coil 12 insuch manner as to again repel coil 21 and assist the spring 20 inreducing the resistance in the field so long as both the generator andbattery are supplying current to the translating devices. If thegenerator slow down until its voltage be practically equal or slightlyless than that of the battery the switch 5 may be caused to open andcurrent will no longer flow through much as its circuit is not opened bythe opening of the main switch 5.

From the above description of my invention it will be obvious thatcurrent supplied to the battery by the generator will tend to cutdownthe generator voltage and the system may be arranged so as to cut downthe voltage whenthe' battery is receiving a predetermined desiredcurrent maximum and when the battery is supplying part of the current tothe lamps or translating devices, its current tends to increase thevoltage of the generator so as to tend to make it supply more currentand relieve the battery of part of its load. Also it will be obviousthat as the voltage of the battery rises due to charging, the current inthe coil 21 will tend to increase and thereby cause the attractionbetween the said coil and the coil 12 to serve to cut'down the generatorvoltage with less current flowing in the coil 12 so that as the voltageof the battery rises the charging current will be automatically cut downand thus give the battery a desired tapering charge.

I do not wish in any way to limit myself to any exact details ofconstruction or pre cise mode of operation set forth in the abovespecification or shown in the drawing, the same being intended to merelyset forth one form of apparatus embodying my invention in which greatalteration and variation may be made without departing from the spiritthereof.

by current flowing into the battery from.

the generator tends to cause the generator output to be decreased, andcurrent flowing from the battery to the work circuit tends to cause thegenerator output to be increased.

2. The combination with a generator, a regulating element therefor, astorage battery and a work circuit, of means for controlling saidelement comprising devicesmovably mounted with relation to each otherand adapted to act conjointly or differentially, whereby current flowinginto the battery from the generator tends to cause the generator outputto be decreased, and current flowing from the battery to the workcircuit tends to cause the generator output to be increased.

3. The combination with a generator, at regulating element therefor, astorage battery and a work circuit, of means for controlling saidelement comprising devices connected to attract each other to cause thegenerator output to be decreased when current flows into the batteryfrom the generator, and to repel each other to cause the generatoroutput to be increased when current flows from the battery to the workcircuit.

4. The combination with a generator, a

regulating element therefor, a storage batthe generator output to beincreased whencurrent flows from the battery to the work circuit.

5. The combination with a generator, a regulating element therefor, astorage bat" tery and a work circuit, of means for controlling saidelement comprising a pair of coils connected to attract and repel eachother, whereby current flowing into the battery from the generator tendsto cause the generator output to be decreased, and current flowing fromthe battery to the work circuit tends to cause the generator output tobe increased.

6. The combination with a generator, a regulating element therefor, astorage battery and a work circuit, of means for controlling saidelement comprising coils connected to attract each other to cause thegenerator output to be decreased when current flows into the batteryfrom the generator, and to repel each other when current flows from thebattery to the work circuit to tend to cause the generator output to beincreased.

7. The combination with a generator, a regulating element therefor, astorage battery and a work circuit, of means for controlling saidelement comprising relatively movable coils, whereby current flowinginto the battery from the generator tends to cause the generator outputto be decreased, and current flowing from the battery to the workcircuit tends to cause the generator output to be increased.

8. The combination with a generator, a regulating element therefor, astorage battery and a work circuit, of means for controlling saidelement comprising relatively movable coils connected to act conjointlywhen current flows into the battery from the generator to tend to causethe generator output to be decreased, and tr; act differew tially whencurrent flows from the battery to the w rk circuit, whereby to cause thegenerator output to be increased.

9. The combination with a generator, a storage battery and a workcircuit, of a regulator for the generator provided with a plurality ofactuating coils having interacting magnetic fields for controlling theregulator and connections for said coils with the generator and the workcircuit, whereby when one coil is inert current in another coil will notaffect the regulator.

10. The combination with a generator, a storage battery and a workcircuit, of a reg ulator for the generator provided with a lurality ofactuating coils having interacting magnetic fields for controlling thegenerator, and maans for controlling the connection of said partsincluding the connection of the generator with the work circuit forpreventing current in one of the coils from affecting the, regulatorwhen the other coil is inert.

11. The combination with a generator, storage battery and a workcircuit, of a regulator for the generator comprehending a coil in serieswith the battery and a coil in shunt to the battery, the operation ofwhich is determined by the coil in series with the battery cooperatingwith the coil in shunt to the battery and attracting or repelling saidshunt coil depending upon whether the current is flowing from thegenerator to the battery or from the battery to the work circuit.

12. The combination with a generator, a storage battery and a workcircuit, of a regulator for the generator, means for operating saidregulator comprising a movable coil across a circuit of substantiallyconstant electro-motive-force, a coil cooperating therewith to cause thesame to move so arranged as to cause the movable coil to move in onedirection when current flows from the generator to the battery and in anopposite direction when current flows from the battery to the workcircuit.

JOHN L. GREVELING.

Witnesses E. HALL, M. HERsKovrrz.

